Legal claims defining the scope of protection, as filed with the USPTO.
2. A method according to claim 1, wherein said first speech comprises any speech.
3. A method according to claim 1, wherein said first speech comprises a predetermined trigger phrase.
7. A method according to claim 1, wherein the spoof detection circuit examines at least a component of said audio signal at frequencies higher than 8 kHz.
9. A method according to claim 4, further comprising, when no speech is detected in the received audio signal, controlling the decimator such that the decimated audio signal has said predetermined sample rate.
11. A method according to claim 8, wherein said third sample rate is in the range 50 kHz to 400 kHz.
12. A method according to claim 1, wherein said second sample rate is in the range 200 kHz to 1 MHz.
13. A method according to claim 1, wherein said first sample rate is in the range 1 MHz to 8 MHz.
14. A method according to claim 4, wherein said predetermined sample rate is in the range 10 kHz to 60 kHz.
17. An audio processing circuit according to claim 15, wherein the spoof detection circuit examines at least a component of said audio signal at frequencies higher than 8 kHz.
19. An audio processing circuit according to claim 18, wherein said third sample rate is in the range 50 kHz to 400 kHz.
20. An audio processing circuit according to claim 15, wherein said second sample rate is in the range 200 kHz to 1 MHz.
21. An audio processing circuit according to claim 15, wherein said first sample rate is in the range 1 MHz to 8 MHz.
22. An audio processing circuit according to claim 16, wherein said predetermined sample rate is in the range 10 kHz to 60 kHz.
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November 1, 2022
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